User Manual 2461 Type C
A-23
Frequency Standard
The UCT requires a 10MHz frequency standard in order to function. This can be derived
from the VXI ‘CLOCK10’ (generated by the SLOT0 controller), from an external 10MHz
standard connected to the front panel, or from an optional internally installed TCXO or
OCXO. The default setting is ‘CLK10’. A buffered version of the standard in use is
available at the front panel ‘STD OUT’ connector.
Internal Standard Output
Frequency:
10MHz
Output Configuration
LSTTL with 47
Ω
Series resistor.
Drive Level:
V
OH
2.6V min. at -400
µ
A
V
OL
0.6V max. at 8mA
The output is also capable of driving 1Vpk-pk min,
into 50
Ω
Maximum Reverse Input:
Tested to
±
5V without damage.
(CAUTION)
Connector:
MCX female
External Standard Input
Frequency:
10MHz
Signal Level:
100mV RMS sinewave minimum, 10V RMS maximum.
Maximum Input Level:
10VRMS, or +15V or –15V peak..
(CAUTION)
Input Impedance:
1k
Ω
nominal for signals less than 1Vpk-pk decreasing to 500
Ω
nominal for signals 10Vpk-pk and above.
Coupling:
AC
Connector:
MCX female
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